class Person {
    constructor(name, age, email) {
        this.name = name
        this.age = age
        this.email = email
    }
    sayHi() {
        console.log("Hello, I am " + this.name);
    }
}

const Animal = class { }

const leon = new Person('leon', 35, "illikang@163.com")
const mike = new Person('mike', 30, "mike@163.com")

console.log(leon);
leon.sayHi()
console.log(mike);
mike.sayHi()
